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Neutron and X-ray scattering on the monolayer structure of a lecithin fullerene-derivative.
Jeng, U-Ser,Lin, Tsang-Lang,Shin, Kwanwoo,Lee, Hsin-Yi,Hsu, Chia-Hung,Chi, Zau-Ann,Shih, Ming Chih,Torikai, Naoya American Scientific Publishers 2007 Journal of Nanoscience and Nanotechnology Vol.7 No.4
<P>Using neutron reflectivity with contrast variation, X-ray reflectivity, and grazing incident small-angle X-ray scattering (GISAXS), we have characterized the in-depth and in-plane structural characteristics of the Langmuir and Langmuir-Blodgett (LB) films formed by a novel lecithin C60-derivative, FPTL, of three phospholipids jointly bonded on one single olefinic moiety of a C60 cage. Based on the neutron reflectivity measured, we have proposed a monolayer structure, with the C60 cages of FPTL lifted into the air and hydrophilic phospholipid heads immersed in water, for the FPTL Langmuir layer formed on water. On the other hand, the LB film of FPTL prepared on mica exhibits clear Kiessig fringes in the X-ray reflectivity profile, indicating a 27 angstroms monolayer film with less molecular orientation. With GISAXS, we have extracted an in-plane correlation length of about 210 A for a possible in-plane aggregation of C60 of FPTL in the LB monolayer. We have also demonstrated the highly ordered monolayer structures of a lecithin lipid, in elucidating the positive effect of the attached functional group-phospholipids on the monolayer formation of the lecithin C60-derivative.</P>
Kang, Ki Ser,Lee, Eun Woo,Kang, Soo Yong,Jang, Eui Chan,Ryu, Ho Sung,Suk, Jeng Sik 대한척추외과학회 1999 대한척추외과학회지 Vol.6 No.1
파열된 섬유륜을 통해 수액이 신경초내로 탈출하는 신경초내 추간판 탈출증은 매우 희귀하며, 수술전에 진단하기 어려운 질환이다.본 증례의 경우 수술전 자기 공명 영상에서 우측 제 1 천추 신경근이 반대측에 비해 상당히 팽윤되어 신경초 낭종과 유사한 소견을 보였으나, 수술시 우측 제 1 천추 신경근이 방추상으로 팽윤되고 전벽에 유착되어있는 소견을 나타내었다. 저자들은 신경초 종양 의심 하에 수술 현미경하에서 신경초막을 수직 절개하고 신경근을 압박하고 있는 두 개의 종물을 제거하였고 조직 검사상 퇴행성 변성이 있는 추간판 물질로 판명되어 신경초내 추간판 탈출증 을 확진할 수 있었다 환자는 수술 후 증상이 곧 호전되었고 일상 생활로 복귀하는 좋은 결과를 보였기에 문헌 고찰과 함께 보고하는 바이다. Intraradicular disc herniation is a very rare form of disc herniation because the disc should migrate distally and laterally to enter the nerve root sheath. No case has been diagnosed before surgery. We descibe a 72-year-old woman who has an intraradicular disc herniation into the S1 nerve root and summarize the common features of the past reported 12 cases and this one. MRI showed enlarged nerve sleeve simulating root cyst at the S1 body level. At surgery, fusiform swelling of S1 nerve root adhered to anterior structure was seen and root tumor was suspected. Through the incised opening of the root sheath, two pieces of disc fragment were removed and final diagnosis of intraradicular disc herniation was made. Biopsy of extracted fragments revealed degenerative collagenous tissue. Patient’s symptom was relieved almost immediately after surgery. An unusual form of intraradicular disc herniation is presented with review of the English language literatures.
Chuang Wei-Tsung,Jeng U-Ser,Sheu Hwo-Shuenn,Hong Po-Da The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.1
We conducted simultaneous, small-angle, X-ray scattering/differential scanning calorimetry (SAXS/DSC) and simultaneous, wide-angle, X-ray scattering (WAXS)/DSC measurements for a polymer blend of poly($\varepsilon$-caprolactone)/poly(ethylene glycol)(PCL/PEG). The time-dependent SAXS/DSC and WAXS/DSC results, measured while the system was quenched below the melting temperature of PCL from a melting state, revealed the competitive behavior between liquid-liquid phase separation and crystallization in the polymer blend. The time-dependent structural evolution extracted from the SAXS/WAXS/DSC results can be characterized by the following four stages in the PCL crystallization process: the induction (I), nucleation (II), growth (III), and late (IV) stages. The influence of the liquid-liquid phase separation on the crystallization of PCL was also observed by phase-contrast microscope and polarized microscope with 1/4$\lambda$ compensator.